PROBLEM: Big Tires
My Ford Bronco was fitted at the factory with
30 inch diameter tires. That means its speedometer is calibrated
for 30 inch diameter tires. I "enhanced" the vehicle
with All Terrain tires that have a 31 inch diameter. How will
this change the speedometer readings? Specifically, assuming the
speedometer was accurate in the first place, what should I make
the speedometer read as I drive with my 31 inch tires so that
the actual speed is 55 mph?
Forego the discussion of whether it is safe to drive a Bronco
that fast . . .
One would expect some use of ratios here . . .
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